When Kiddell, posing as Mr Russell, turned up for an appointment he was arrested by plain clothes police.
Fatah-linked Palestinian security officers in plain clothes manned the barricades and lit tyres.
An undisclosed number of plain clothes police officers are travelling to Germany to help identify offenders who slip through the net.
Metal detectors will be positioned at the end of the gangplank, while sniffer dogs and uniformed and plain clothes policemen will stand guard.
Miners say plain clothes police have infiltrated picket lines and officers have also been turning away pickets thought likely to cause a breach of the peace.
The Superintendents' Association, which represents senior officers below the rank of chief constable, argues that officers could patrol alone, rather than in pairs, and detectives could work in uniform, rather than in plain clothes.
Allow councils to use plain-clothes inspectors to detect parking-badge fraud and to recover badges that have been cancelled.
One group recently attacked several stallholders at an open-air market in Rafina, a port near Athens, after posing as plain-clothes police checking their permits.
The BBC's Owen Bennett-Jones says the trouble began when one of Mr Sharif's co-accused claimed that there were plain-clothes intelligence officers in the courtroom on Wednesday.
She had no time for semantics: whether to include deaths outside the city walls, whether the plain-clothes soldiers had been billeted with civilians, and so on.
On February 4th Mr Diallo, a young Guinean with no criminal record, was challenged outside his apartment building by four plain-clothes police officers, looking for a rape suspect.
Han has several staff cutting clothes in a back room in plain sight of guests.
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